diff --git a/playbooks/ns.yml b/playbooks/ns.yml
new file mode 100644
index 0000000..e29c441
--- /dev/null
+++ b/playbooks/ns.yml
@@ -0,0 +1,6 @@
+- name: Configure bind9 name server
+  hosts: all
+  tasks:
+  - name: Configure services to install in the server
+    import_role:
+      name: ns
\ No newline at end of file
diff --git a/roles/ns/defaults/main.yml b/roles/ns/defaults/main.yml
new file mode 100644
index 0000000..daeccf4
--- /dev/null
+++ b/roles/ns/defaults/main.yml
@@ -0,0 +1,29 @@
+bind_packages:
+  - bind9
+  - bind9-dnsutils
+  - bind9-host
+  - bind9-libs
+  - bind9-utils
+  - dnsutils
+  - python3-pycurl
+bind_config_templates:
+  - { src: 'named.conf.j2', dest: '/etc/bind/named.conf', mode: 'u=rw,g=r,o=r' }
+  - { src: 'named.conf.master.j2', dest: '/etc/bind/named.conf.master', mode: 'u=rw,g=r,o=r' }
+  - { src: 'named.conf.local.j2',  dest: '/etc/bind/named.conf.local',  mode: 'u=rw,g=r,o=r' }
+  - { src: 'named.conf.slave.j2', dest: '/etc/bind/named.conf.slave', mode: 'u=rw,g=r,o=r' }
+  - { src: 'certbot.key', dest: '/etc/bind/keys/certbot.key', mode: 'u=rw,g=r,o=' }
+  - { src: 'lan.key', dest: '/etc/bind/keys/lan.key', mode: 'u=rw,g=r,o=' }
+  - { src: 'wan.key', dest: '/etc/bind/keys/wan.key', mode: 'u=rw,g=r,o=' }
+  - { src: 'rndc.key', dest: '/etc/bind/rndc.key', mode: 'u=rw,g=r,o=' }
+  - { src: 'dhcp.key', dest: '/etc/bind/keys/dhcp.key', mode: 'u=rw,g=r,o=' }
+  - { src: 'isp1.ns', dest: '/root/scripts/switch-isp', mode: 'u=rw,g=rw,o=r' }
+  - { src: 'isp2.ns', dest: '/root/scripts/switch-isp', mode: 'u=rw,g=rw,o=r' }
+directory:
+  - { path: '/root/scripts', owner: 'root', group: 'root', mode: 'u=rwx,g=rx,o=rx' }
+  - { path: '/etc/bind/keys', owner: 'root', group: 'bind', mode: 'u=rwx,g=rxs,o=rx' }
+  - { path: '/root/scripts/switch-isp', owner: 'root', group: 'bind', mode: 'u=rwx,g=rxs,o=rx' }
+required_files:
+  - { src: 'delete.ns', dest: '/root/scripts/switch-isp', owner: 'root', group: 'bind', mode: 'u=rw,g=rw,o=r' }
+  - { src: 'switch-isp.sh', dest: '/root/scripts', owner: 'root', group: 'root', mode: 'u=rwx,g=rx,o=rx' }
+  - { src: 'sync-conf', dest: '/root/scripts', owner: 'root', group: 'root', mode: 'u=rwx,g=rx,o=rx' }
+  - { src: 'gen-key.sh', dest: '/root/scripts', owner: 'root', group: 'bind', mode: 'u=rwx,g=rx,o=rx' }
diff --git a/roles/ns/files/delete.ns b/roles/ns/files/delete.ns
new file mode 100644
index 0000000..cbb97ad
--- /dev/null
+++ b/roles/ns/files/delete.ns
@@ -0,0 +1,14 @@
+update delete verdnatura.es              A
+update delete kube-proxy.verdnatura.es   A
+update delete smtp.verdnatura.es         A
+update delete imap.verdnatura.es         A
+update delete autodiscover.verdnatura.es A
+update delete time1.verdnatura.es        A
+update delete time2.verdnatura.es        A
+update delete dc-ip01.verdnatura.es      A
+update delete dc-ip02.verdnatura.es      A
+update delete dc-ip03.verdnatura.es      A
+update delete dc-ip04.verdnatura.es      A
+update delete mailgw1.verdnatura.es      A
+update delete mailgw2.verdnatura.es      A
+send
diff --git a/roles/ns/files/gen-key.sh b/roles/ns/files/gen-key.sh
new file mode 100644
index 0000000..4c062a2
--- /dev/null
+++ b/roles/ns/files/gen-key.sh
@@ -0,0 +1,10 @@
+#!/bin/bash
+
+KEYNAME=$1
+
+if [ -z "$KEYNAME" ]; then
+    echo "Usage: $0 <key_name>"
+    exit 1
+fi
+
+tsig-keygen -a hmac-sha512 "$KEYNAME"
diff --git a/roles/ns/files/switch-isp.sh b/roles/ns/files/switch-isp.sh
new file mode 100644
index 0000000..5444192
--- /dev/null
+++ b/roles/ns/files/switch-isp.sh
@@ -0,0 +1,23 @@
+#!/bin/bash
+
+ISP=$1
+
+if [ -z "$ISP" ]; then
+    echo "Usage: $0 <isp_name>"
+    exit 1
+fi
+
+KEY_FILE="/etc/bind/keys/wan.key"
+NS_DIR="/root/scripts/switch-isp"
+ISP_FILE="$NS_DIR/$ISP.ns"
+
+if [ ! -f "$ISP_FILE" ]; then
+    echo "ISP file for nsupdate not found: $ISP_FILE"
+    exit 2
+fi
+
+echo "Deleting ISP dependent DNS records."
+nsupdate -k "$KEY_FILE" "$NS_DIR/delete.ns"
+
+echo "Registering $ISP DNS records."
+nsupdate -k "$KEY_FILE" "$ISP_FILE"
diff --git a/roles/ns/files/sync-conf b/roles/ns/files/sync-conf
new file mode 100644
index 0000000..a3b947b
--- /dev/null
+++ b/roles/ns/files/sync-conf
@@ -0,0 +1,27 @@
+#!/bin/bash
+
+if [ "$(hostname)" = "ns1" ]; then
+	partner=root@ns2.servers.dc.verdnatura.es
+else
+	partner=root@ns1.servers.dc.verdnatura.es
+fi
+
+confDir=/etc/bind
+
+echo "Restarting service."
+service bind9 restart
+
+if [ $? -eq "0" ]; then
+	echo "Synchronizing partner configuration."
+
+	scp "$confDir/named.conf.local" $partner:$confDir
+	scp "$confDir/named.conf.master" $partner:$confDir
+	scp "$confDir/named.conf.slave" $partner:$confDir
+
+	ssh "$partner" rm -rf "$confDir/keys"
+	ssh "$partner" mkdir "$confDir/keys"
+	scp -r "$confDir/keys/"* $partner:"$confDir/keys"
+
+	echo "Restarting partner service."
+	ssh $partner service bind9 restart
+fi
diff --git a/roles/ns/handlers/main.yml b/roles/ns/handlers/main.yml
new file mode 100644
index 0000000..840d041
--- /dev/null
+++ b/roles/ns/handlers/main.yml
@@ -0,0 +1,4 @@
+- name: restart-dns
+  systemd:
+    name: bind9
+    state: restarted
\ No newline at end of file
diff --git a/roles/ns/tasks/main.yml b/roles/ns/tasks/main.yml
new file mode 100644
index 0000000..0948ab4
--- /dev/null
+++ b/roles/ns/tasks/main.yml
@@ -0,0 +1,2 @@
+- import_tasks: ns.yml
+  tags: ns
diff --git a/roles/ns/tasks/ns.yml b/roles/ns/tasks/ns.yml
new file mode 100644
index 0000000..7943efa
--- /dev/null
+++ b/roles/ns/tasks/ns.yml
@@ -0,0 +1,34 @@
+- name: Update apt cache
+  apt:
+   update_cache: yes
+- name: Install bind package requirements
+  apt:
+    name: "{{ bind_packages }}"
+    state: present
+    install_recommends: no
+- name: Create directory
+  file:
+    path: "{{ item.path }}"
+    state: directory
+    owner: "{{ item.group }}"
+    group: "{{ item.group }}"
+    mode: "{{ item.mode }}"
+  loop: "{{ directory }}"
+- name: Copy required files and scripts
+  copy:
+    src: "{{ item.src }}"
+    dest: "{{ item.dest }}"
+    owner: "{{ item.group }}"
+    group: "{{ item.group }}"
+    mode: "{{ item.mode }}"
+  loop: "{{ required_files }}"
+- name: Deploy BIND config templates
+  template:
+    src: "{{ item.src }}"
+    dest: "{{ item.dest }}"
+    owner: root
+    group: bind
+    mode: "{{ item.mode }}"
+  loop: "{{ bind_config_templates }}"
+  notify: restart-dns
+  
diff --git a/roles/ns/templates/certbot.key b/roles/ns/templates/certbot.key
new file mode 100644
index 0000000..6e9f1b9
--- /dev/null
+++ b/roles/ns/templates/certbot.key
@@ -0,0 +1,4 @@
+key "certbot" {
+	algorithm hmac-sha512;
+	secret "{{ lookup(passbolt, 'certbot', folder_parent_id=passbolt_folder).password }}";
+};
diff --git a/roles/ns/templates/dhcp.key b/roles/ns/templates/dhcp.key
new file mode 100644
index 0000000..a732d1e
--- /dev/null
+++ b/roles/ns/templates/dhcp.key
@@ -0,0 +1,4 @@
+key "dhcp" {
+	algorithm hmac-sha512;
+	secret "{{ lookup(passbolt, 'dhcpkey', folder_parent_id=passbolt_folder).password }}";
+};
diff --git a/roles/ns/templates/isp1.ns b/roles/ns/templates/isp1.ns
new file mode 100644
index 0000000..57eba65
--- /dev/null
+++ b/roles/ns/templates/isp1.ns
@@ -0,0 +1,4 @@
+{% for record in dns_records_main %}
+update add {{ record.name.ljust(30) }} {{ record.ttl }}   A  {{ record.ip }}
+{% endfor %}
+send
diff --git a/roles/ns/templates/isp2.ns b/roles/ns/templates/isp2.ns
new file mode 100644
index 0000000..e89b38e
--- /dev/null
+++ b/roles/ns/templates/isp2.ns
@@ -0,0 +1,4 @@
+{% for record in dns_records_secondary %}
+update add {{ record.name.ljust(30) }} {{ record.ttl }}   A  {{ record.ip }}
+{% endfor %}
+send
diff --git a/roles/ns/templates/lan.key b/roles/ns/templates/lan.key
new file mode 100644
index 0000000..c99ad33
--- /dev/null
+++ b/roles/ns/templates/lan.key
@@ -0,0 +1,4 @@
+key "lan" {
+	algorithm hmac-sha512;
+	secret "{{ lookup(passbolt, 'lankey', folder_parent_id=passbolt_folder).password }}";
+};
diff --git a/roles/ns/templates/named.conf.j2 b/roles/ns/templates/named.conf.j2
new file mode 100644
index 0000000..32e13f7
--- /dev/null
+++ b/roles/ns/templates/named.conf.j2
@@ -0,0 +1,16 @@
+// This is the primary configuration file for the BIND DNS server named.
+//
+// Please read /usr/share/doc/bind9/README.Debian.gz for information on the 
+// structure of BIND configuration files in Debian, *BEFORE* you customize 
+// this configuration file.
+//
+// If you are just adding zones, please do that in /etc/bind/named.conf.local
+
+#include "/etc/bind/named.conf.options";
+include "/etc/bind/named.conf.local";
+{% if bind_is_master %}
+include "/etc/bind/named.conf.master";
+{% else %}
+include "/etc/bind/named.conf.slave";
+{% endif %}
+#include "/etc/bind/named.conf.default-zones";
diff --git a/roles/ns/templates/named.conf.local.j2 b/roles/ns/templates/named.conf.local.j2
new file mode 100644
index 0000000..09a8935
--- /dev/null
+++ b/roles/ns/templates/named.conf.local.j2
@@ -0,0 +1,30 @@
+include "/etc/bind/rndc.key";
+include "/etc/bind/keys/wan.key";
+include "/etc/bind/keys/lan.key";
+include "/etc/bind/keys/certbot.key";
+include "/etc/bind/keys/dhcp.key";
+
+server fe80::/16 { bogus yes; };
+
+acl lan {
+    10.0.0.0/8;
+    172.16.0.0/12;
+    192.168.0.0/16;
+  };
+  
+acl rfc5735 {
+    0.0.0.0/8;
+    169.254.0.0/16;
+    192.0.0.0/24;
+    192.0.2.0/24;
+    192.88.99.0/24;
+    198.18.0.0/15;
+    198.51.100.0/24;
+    203.0.113.0/24;
+    224.0.0.0/4;
+    240.0.0.0/4;
+  };
+
+controls {
+	inet * allow { localhost; lan; } keys { "rndc-key"; };
+};
diff --git a/roles/ns/templates/named.conf.master.j2 b/roles/ns/templates/named.conf.master.j2
new file mode 100644
index 0000000..dc63834
--- /dev/null
+++ b/roles/ns/templates/named.conf.master.j2
@@ -0,0 +1,78 @@
+options {
+    directory "/var/cache/bind";
+    max-cache-size 500m;
+    auth-nxdomain no;
+    listen-on-v6 { none; };
+    version "DNS";
+    allow-update { none; };
+    blackhole { rfc5735; };
+
+    allow-transfer {
+    {% for ip in bind_allow_transfer %}
+        {{ ip }};
+    {% endfor %}
+    };
+};
+
+view "lan" {
+        match-clients {
+        {% for item in key_match_clients_lan_master if item.startswith("!key") %}
+          {{ item }};
+          {% endfor %}
+{% for item in acl_match_clients %}
+        {{ item }};
+          {% endfor %}
+{% for item in key_match_clients_lan_master if not item.startswith("!key") %}
+        {{ item }};
+          {% endfor %}
+};
+
+    recursion yes;
+    allow-recursion { any; };
+    empty-zones-enable yes;
+    notify yes;
+
+    include "/etc/bind/named.conf.default-zones";
+
+    {% for zone in bind_zones.lan %}
+    zone "{{ zone.name }}" {
+        type master;
+        forwarders {};
+        allow-update { key {{ zone.key }}; };
+        file "{{ zone.file }}";
+    };
+    {% endfor %}
+};
+
+view "wan" {
+    match-clients { any; };
+
+    recursion no;
+    allow-query-cache { none; };
+    empty-zones-enable no;
+
+    notify explicit;
+
+    also-notify {
+    {% for entry in bind_also_notify %}
+        {{ entry.ip }} key {{ entry.key }};
+    {% endfor %}
+    };
+
+    {% for zone in bind_zones.wan %}
+    {% if zone.in_view is defined %}
+    {% for z in zone.in_view %}
+    zone "{{ z }}" {
+        in-view "lan";
+    };
+    {% endfor %}
+    {% else %}
+    zone "{{ zone.name }}" {
+        type master;
+        forwarders {};
+        allow-update { key {{ zone.key }}; };
+        file "{{ zone.file }}";
+    };
+    {% endif %}
+    {% endfor %}
+};
diff --git a/roles/ns/templates/named.conf.slave.j2 b/roles/ns/templates/named.conf.slave.j2
new file mode 100644
index 0000000..c1142a1
--- /dev/null
+++ b/roles/ns/templates/named.conf.slave.j2
@@ -0,0 +1,73 @@
+options {
+    directory "/var/cache/bind";
+    max-cache-size 500m;
+    auth-nxdomain no;
+    listen-on-v6 { none; };
+    version "DNS";
+    allow-update { none; };
+    blackhole { rfc5735; };
+
+    notify no;
+    allow-transfer { none; };
+    masterfile-format text;
+};
+
+masters master-ips {
+{% for ip in bind_slave_masters %}
+    {{ ip }};
+{% endfor %}
+};
+
+view "lan" {
+        match-clients {
+        {% for item in key_match_clients_lan_master if item.startswith("!key") %}
+          {{ item }};
+          {% endfor %}
+{% for item in acl_match_clients %}
+        {{ item }};
+          {% endfor %}
+{% for item in key_match_clients_lan_slave if not item.startswith("!key") %}
+        {{ item }};
+          {% endfor %}
+};
+
+    recursion yes;
+    allow-recursion { any; };
+    empty-zones-enable yes;
+
+    include "/etc/bind/named.conf.default-zones";
+
+    {% for zone in bind_zones.lan %}
+    zone "{{ zone.name }}" {
+        type slave;
+        masters { master-ips; };
+        forwarders {};
+        file "{{ zone.file }}";
+    };
+    {% endfor %}
+};
+
+view "wan" {
+    match-clients { any; };
+
+    recursion no;
+    allow-query-cache { none; };
+    empty-zones-enable no;
+
+    {% for zone in bind_zones.wan %}
+    {% if zone.in_view is defined %}
+    {% for z in zone.in_view %}
+    zone "{{ z }}" {
+        in-view "lan";
+    };
+    {% endfor %}
+    {% else %}
+    zone "{{ zone.name }}" {
+        type slave;
+        masters { {{ bind_slave_masters | join('; ') }} key {{ zone.key }}; };
+        forwarders {};
+        file "{{ zone.file }}";
+    };
+    {% endif %}
+    {% endfor %}
+};
diff --git a/roles/ns/templates/rndc.key b/roles/ns/templates/rndc.key
new file mode 100644
index 0000000..40d9600
--- /dev/null
+++ b/roles/ns/templates/rndc.key
@@ -0,0 +1,4 @@
+key "rndc-key" {
+	algorithm hmac-md5;
+	secret "{{ lookup(passbolt, 'rndc-key', folder_parent_id=passbolt_folder).password }}";
+};
diff --git a/roles/ns/templates/wan.key b/roles/ns/templates/wan.key
new file mode 100644
index 0000000..daa655c
--- /dev/null
+++ b/roles/ns/templates/wan.key
@@ -0,0 +1,4 @@
+key "wan-key" {
+	algorithm hmac-md5;
+	secret "{{ lookup(passbolt, 'wan-key', folder_parent_id=passbolt_folder).password }}";
+};